Stop mechanism  eor motion-p



APPLlCATiON FILED JAN-13; I919.

Patented Oct. 7, 1919.

Iizvezzfory: 7702 Harry 674/71 m'f flan/ 5 Koch UNITED sTAT s PATENT orrron.

HARRY GRANVILLE AND FRANK KOCH, 0F SGRANTON, PENNSYLVANIA v STOP MECHANISM: FOR MOTION-EICTUEE MACHINES.

Specification of Letters Patent.

Patented Gets '7, 1919.

Application filed January 13, 1919. Serial No. 270358.

To all whom it may concern Be it known that we, HARRY GRANVILLE of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Stop Mechanism for Motion-Picture Machines; and we dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which for the frequent fires in motion picture machines due to the beam of light being permitted to strike the very inflammable film on which the negatives are formed. Divers means have been proposed for interrupting the light in its passage to the film when the latter becomes motionless at the apertured plate, the. object of this being to prevent the film from being ignited by the beam of light. Fires may be caused therefore as the result either of the reel backing up which permits the film to slow down or stop in front of the apertured plates; or if the film breaks and a portion is exposed at the aperture, and again fires will result if the driving belt of the machine breaks and in many of these emergencies and eventualities as a usual thing the machine continues to run.

It is the object of the present invention to provide for the interruption of the operation of the driving motor of the machine upon the occurrence of any of these causes and also of others well known to those versed in the art. A further object of the invention is to provide combined means for interrupting the flow of light to the film and also to secure simultaneously or concurrently the i-nterruption of the operation of the driving motor from any one or possible combinations of the above causes. Among the objects qf the invention may be mentioned the providing of'a film control device connected to automatically acting means for interrupting the flow of the beam of light and also for interrupting the motion of the machine and further to provide an apparatus for these purposes which is simple in construction and readily applied to existin machines or combined with the organization of new machines, and which is relatively inexpensive and reliable in operation. and FRANK Keen, citizens of the United 7 States, residing at Scranton, in the county With these and other objects in View as will be rendered manifest to those skilled in the art, the invention consists in the con struction, the combination, and in details and arrangement of the .parts, as will be more particularly described in the following specification relative to the embodiment of the invention illustrated in the accompanying drawings in which Figure 1 is a side elevation of the apparatus as combined with .a swinging door commonly employed to cover guide roller and feed sprockets for the film; and Fig. 2 is a rear elevation of the door with the automatic mechanism thereon.

in Patent No. 1,277 ,951, dated September 3,v

1918. But obviously the novel mechanism controlling the interruption of the operation of the motor may be appropriately controlled by and adapted to other types of mo tion picture apparatus. In the above identified patent and in the present application A indicates the usual apertured plate through which a beam of light from a suitable source is projected on the film B, which passes around suitable feed sprockets 20 to the lower guide rolls 21 and between which sprocket and rollers is arranged a tension device comprising a set of rollers 16 on a shaft 14 which is secured to a swinging arm 10 and projects laterally therefrom. The arm 10 is pivotally mounted on a stud 12 and is connected to a chain 7 or other suitable flexible element extended rearwardly through pressed to the position shown in Fig. 1 the arm 10 may be swung about its pivot 12 so that the rollers 16 and the shaft 14 therefor stand parallel to the normal position of the film B, passing tangentially down from the feed sprocket 20 and when the film is tensioned it controls movement of the b above described type, means for stopping the operation of the driving motor in the event that because of the backing up of a reel, or the breaking of the driving belt, or of the film, the film becomes substantially stationary in front of the light aperture. To

that end we have shown as connected to the chain 7 of the automatic device, an arm 25 secured to and insulated from a switch or circuit breaker 26, as at 40, swinging about a pivot screw 27 mounted on a base of insulatin material 28 which is secured to the door shown as provided with a lug 29 to which is connected a spring 30, one end of which is attached to a fixed support which may be connected as at 31 to a lead 32 of a part of the motor circuit, another lead of whichis shown at 33 as connected at 34 to a contact piece 35 with which the swinging switch or arm 26 is adapted to be contacted to close the, circuit when the chain 7, to which it is connected, is pulled downwardly by the setting of the film control device including the arm 10. c 7

From the above it will be seen that when the machine is operating, in the normal manner and the film is under proper tension the rollers 16 on the shaft 14 are supported on and controlled by the adjacent stretch of the film and the shutter AS and the circuit breaking arm 26 are held in set positions against the tendency of the spring 6 and the spring 30 to automatically actuate their respective parts. the film B gives way under the pressure of the rollers 16 produced by the springs 6 and 30 then the shutter will be allowed to swing to the lightcutting off position and the.

circuit breaker will be thrown open by its spring 36 and the motor circuit broken so that the motor will cease to operate and the machine become motionless.

It is to be understood that various modifications and alterations and changes in form The circuit breaker, or arm 26, is

In the event thatand construction may be resorted to in the construction of an apparatus within the spirit of the invention and scopeof the appended claims.

We claim:

1. In a motion picture apparatus, a housing including a gate, an insulator base thereon, a motor circuit, a lever pivotally supported by said base, a tension spring connected to one terminal of said motor circuit and secured to one end of said lever, a contact member forming a second terminal for said circuit, a horizontally swinging tension device for the film, and means connecting said tension device and the other end of said lever whereby said lever is brought into engagement with the contact member.

2. In a motion picture apparatus, a housing including a gate, an insulator base mounted thereon, a motor circuit having a pair of unconnected terminals, a horizontally pivoted bell crank lever supported thereby, a tension device secured to one arm thereof, and connected to a terminal of said motor circuit, a contact member secured to another of said terminals, a horizontally swinging tension device for the film vertically pivoted to said gate, an extension secured to, and insulated from the other arm of said bell crank, and means connecting said extension and said tensionv device, Whereby the last named" arm of said bell crank is brought into engagement with the contact member when the tension device is brought into engagement with the film.

3. In a motion picture machine having a motor and an open circuit therefor, a tension spring having one end connected to one terminal of said circuit and a contact member secured to a second terminal thereof, a bell crank lever pivoted intermediate the terminals and having the other end of said spring secured to one arm thereof, a film tension device connected to the other arm of said bell crank, and means connecting said last named arm and said tension device whereof we alfix our signa- V 

